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You undertake these modifications at your own risk, I do not accept any responsibilty for any damage, accident, or expense which arises from following these instructions. If in doubt take it to a proper garage.
The standard non-injected CVH engine of the XR2 can be modified to produce extra power, however significant gains can be had by careful replacement of some restrictive original equipment parts for not to much expense. In particular you can benefit most from improved engine air and fuel flow which will cost more depending on the power gains.
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Stage 1: By replacing the original air filter and the exhaust system with performance versions,
power can be increased from a standard engine. If you decide to buy when
you need to replace the standard items, then considerable long term savings can be made as they have a longer life expectancy. Performance
spark plugs will also increase the power slightly and make the engine
more economic as it will burn fuel more efficiently. Performance spark plug
leads will also help the ignition process.
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Stage 2: A performance camshaft kit can make a vast improvement to the power
output of the engine. Most kits come with improved valve
springs and followers. Relatively inexpensive and fairly easy to fit. To
make sure that the engine is timed accurately fit an adjustable vernier pully.
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Stage 3: To really get the benefits from a performance camshaft you need a cylinder head that
has been optimised to allow for better air and fuel combinations inside the
engine. This can include removing excess material, reshaping the
inlet/exhaust ports and valve seats and polishing which smooths the flow of the mixture through the head.
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Stage 4: By this stage the standard carburettor will be limiting your power
potential of you engine. You can replace it with a fast road version, or
a performance kit of either twin 40 or 45 Webber carbs. This will give the
engine a much improved air supply and can therefore be supplied
with a similarly increased amount of fuel, which in turn increases power!
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As always, more extreme modifications can be made to the block itself including increasing the cubic capacity by boring the cylinders and increasing the diameter of the pistons, you can also lighten and balance the conrods, crankshaft and flywheel assemblies and of course fitting improved equipment such as the oil pump and sump to assist in engine cooling. Small modifications such as the provision for a high pressure fuel pump, an oil intercooler and a performance cambelt can also reap gains in reliability and life expectancy of the engine.
Home / Engine Tuning
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